End of Module 10 Quiz

Which one of the following has a lowest density?

How many compounds, of the ones listed below, have hydrogen bonding?

CH3(CH2)2NH2             CH3(CH2)2NH(CH2)4CH3         (CH3CH2)2N(CH2)4CH3

Consider the phase diagram shown.  Choose the statement below that is TRUE.

Based on the figure above, the boiling point of diethyl ether under an external pressure of  is ________°C.

Choose the compound that exhibits hydrogen bonding as its strongest intermolecular force.

What type of intermolecular force causes the dissolution of  Ca Cl2 in water?

Identify the compound with the lowest boiling point.

A paper clip floating on the top of water is an example of

On a phase diagram, the sublimation curve is between

How much energy is required to heat 36.0 g H2O from a liquid at 65°C to a gas at 115°C?  The following physical data may be useful. ΔHvap = 40.7 kJ/mol Cliq = 4.18 J/g∘C Cgas = 2.01 J/g∘C Csol = 2.09 J/g∘C Tmelting = 0∘C Tboiling = 100∘C

Determine the vapor pressure (in torr) of a substance at 36°C, whose normal boiling point is 84°C and has a ΔHvap of 22.1 kJ/mol.

Determine ΔHvap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K.

Place the following substances in order of increasing vapor pressure at a given temperature.

NF3           NH3          BCl3

Capillary action occurs because

Place the following compounds in order of decreasing strength of intermolecular forces.

I. CH3CH2CH2CH2CH2CH3        II.  (CH3)3CCH3         III.  (CH3)3CCH2CH3

Choose the substance with the lowest surface tension.

Ethanol (OH) melts at -114°C.  The enthalpy of fusion is 5.02 kJ/mol.  The specific heats of solid and liquid ethanol are 0.97 J/gK and 2.3 J/gK, respectively.  How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -125°C to liquid ethanol at -80°C?

The enthalpy change for converting 1.00 mol of ice at -25.0°C to water at 60.0°C is   The specific heats of ice, water, and steam are  2.09 J/g K and  1.84 J/g-K respectively.  For H2O, ΔHfus= 6.01 kJ/mol, and .

Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force.

How much energy is required to vaporize 98.6 g of ethanol (C2H5OH) at its boiling point, if its ΔHvap is 40.5 kJ/mol?